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Amphizonella
Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially enclosed in a simple test (shell). Arcellinid testate amoebae are commonly found in soils, leaf litter, peat bogs and near/in fresh water. They use their pseudopodia, a temporary cell extension, for moving and taking in food. Like most amoebae, they are generally believed to reproduce asexually via binary fission. However a recent review suggests that sexual recombination may be the rule rather than the exception in amoeboid protists in general, including the Arcellinid testate amoebae. Morphology Arcellinida always have a shell or test. The tests lie outside the cell membrane and consist of organic or mineral materials that are either secreted or incorporate external particles. The test has a single main opening. Simple tests are made ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Testate Amoebae
Testate amoebae (formerly thecamoebians, Testacea or Thecamoeba) are a polyphyletic group of unicellular amoeboid protists, which differ from naked amoebae in the presence of a test (biology), test that partially encloses the cell, with an aperture from which the pseudopodia emerge, that provides the amoeba with shelter from predators and environmental conditions. The test of some species is produced entirely by the amoeba and may be organic, siliceous or calcareous depending on the species (autogenic tests), whereas in other cases the test is made up of particles of sediment collected by the amoeba which are then agglutinated together by secretions from within the cell (xenogenic tests). A few taxa (Hyalospheniidae) can build either type, depending on the circumstances and availability of foreign material. The assemblage referred to as "testate amoebae" is actually composed of several, unrelated groups of organisms. However, some features they all share that have been used to g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyalospheniformes
Hyalospheniidae is a family of arcellinid testate amoebae and the sole family of the infraorder Hyalospheniformes. Commonly referred to as "hyalospheniids", these lobose amoebae are characterized by their ability to generate a shell composed of either organic matter or siliceous particles that may be recycled from euglyphid amoebae. They inhabit soil or freshwater habitats, and are abundant on ''Sphagnum'' mosses. Hyalospheniid amoebae originated after the middle Devonian, around 370 million years ago. They are considered important bioindicators, and are frequently used for environmental monitoring. Their fossils are studied to investigate the paleoecology of prehistoric wetland habitats. The classification of hyalospheniids has changed several times since the 19th century based on morphological criteria. Initially classified as two separate families, Hyalospheniidae and Nebelidae, they were later proven to be synonymous through phylogenetic analyses. Morphology Hyalosphen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudocucurbitella
''Pseudocucurbitella'' is a genus of freshwater testate amoebae of the order Arcellinida. Its shell Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses Science Biology * Seashell, a hard outer layer of a marine ani ... is agglutinated, ovoid, with a round crossection and a circular aperture surrounded by 3 to 5 separate lobes forming a short collar. Originally, it was described as a subgenus of '' Difflugia'' in 1960, but was elevated to genus level in 1972. The taxonomic position of ''Pseudocucurbitella'' among Arcellinida is uncertain and the genus has been abandoned by recent classifications, but it was initially assigned to the family Difflugiidae. References Tubulinea Amoebozoa genera {{Amoebozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prantlitina
''Prantlitina'' is a poorly studied genus of testate amoebae discovered in 1957 in Namurian freshwater sediments from the Ostrava-Karviná coal district, in former Czechoslovakia. It was placed in the order Thecamoebina in the defunct class Sarcodina. Later, in 1993, it was recognized as the earliest fossil member of the family Difflugiidae, order Arcellinida, but after that year it does not appear in any classification of Arcellinida or any other group. Etymology The name ''Prantlitina'' was chosen in honor of the Czechoslovak palaeontologist Paleontology, also spelled as palaeontology or palæontology, is the scientific study of the life of the past, mainly but not exclusively through the study of fossils. Paleontologists use fossils as a means to classify organisms, measure geolo ... Dr. Ferdinand Prantl. Taxonomy According to the original description, ''Prantlitina'' contains two subgenera and 6 species, of which only 4 are described and named; the remaining two wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptodifflugiidae
Cryptodifflugiidae is a family of arcellinid testate amoebae. Description Members of this family are conopodous (with conical pseudopods) amoebae with the body in a clear, usually firm, vase-shaped test, and conical pseudopods for locomotion that extend separately from the opening of the test. Classification The classification of the family, as of 2019: * Infraorder Phryganellina Bovee 1985 ** Family Cryptodifflugiidae Penard 1890 ***'' Cryptodifflugia'' Cash 1904 – 23 species *** '' Meisterfeldia'' Bobrov 2016 – 6 species *** '' Wailesella'' Deflandre 1928 – 1 species The 2022 classification places '' Meisterfeldia'' and '' Wailesella'' as Arcellinida ''incertae sedis or is a term used for a taxonomy (biology), taxonomic group where its broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertainty ...'', leaving '' Cryptodifflugia'' as the sole member o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phryganella
Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially enclosed in a simple test (shell). Arcellinid testate amoebae are commonly found in soils, leaf litter, peat bogs and near/in fresh water. They use their pseudopodia, a temporary cell extension, for moving and taking in food. Like most amoebae, they are generally believed to reproduce asexually via binary fission. However a recent review suggests that sexual recombination may be the rule rather than the exception in amoeboid protists in general, including the Arcellinid testate amoebae. Morphology Arcellinida always have a shell or test. The tests lie outside the cell membrane and consist of organic or mineral materials that are either secreted or incorporate external particles. The test has a single main opening. Simple tests are made ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
